Buttonhole-sewing apparatus



A U8 16,1927" F. FHLICH BU'TToNHoLE SEWING APPARATUS Filed May 24. 1926 Patented Aug. 16, 1927. Y UNITED STATES PATENT y OFFICE.

FRITZFRHLICH, 0F BRESLAU, GERMANY.

IBU1'l0NI'IOIiZEwSl-IWING? APPARATUS.

Application filed May 24, `1926, Serial No. 111,447, and in Germany June 5, 1925.

This invention relates to a button-hole which at 24 is connected with a lever 25 sewing apparatus. which is oscillatably mounted on a bolt 26. An embodiment of the invention is shown, Aut the free end of lever 25 a rod 29 is by way of example, in the accompanying hinged which carriesat its end a bolt 30 60 5 drawing in which designed to control, ina manner which will Fig. 1 shows the plate to be fixed on the be hereinafter described, the reciprocating foot rod of the sewing machine, without the movement of the feeding bar. In plate 1 lever'- and gear wheel-connection. (Fig. 1) apertures 31 and 32 are further Fig. 2 shows the button-hole sewing aparranged, between which a bolt 35 is situ- 65 i paratus in plan view, ated. The aperture 32 has two arms 33 and Fig. 3 is a section on line 3-3 of Fig. 2. 34. A plate 36 is pivotally mounted on Fig. 4 is a section on line 4-4 of Fig. 3. the bolt 35 and has an aperture 38 present- Fig. 5 shows the feeding' bar in plan view ing inclined faces 39 and 40. Onv the lower geen from below side of plate 36 a bolt 37 is fixed which pro- 7o l5 Fig. 6 illust-rates a constructional detail. jects through the aperture 31 of the plate Fig. 7 shows in side elevation the button l. The bolt 30 of rod 29 engages through hole sewing apparatus on the foot rod of the the aperture 38 of the plate 36 and through sewing machine and in connection with the JEhe aperture 32 of plate 1. needle rod of the machine On the lower surface of plate 1 the feed- 75 Fig. 8 shows a buttonhole sewn on the lng bar 45 is arranged, freely movable bemachine tween said plate 1 and the cross rods 44, 44 The plate 1 carries a foot 2 by means of (F igS. -3 and 4). y which the apparatus may be fixed on the On the feeding bar 45 a feeder 46 is fixed foot rod 3 (Fig. 7) of the sewing machine and the feeding bar 45 and the feeder So by means 0f the Sei-ew @tof the foot rod. 46 have each an aperture 47 of similar di- This plate 1 has an aperture 5 through lnension for the passage'of the needle. The which the needle passes, said aperture being feeding bar 45 has further a slot 48 with of such size that the stitch in the cloth can which engages the bolt 37 of plate 36, On be observed. The needle rod 7 (Fig. 7) of the other side of the feeder 46 a box-shaped S5 the sewing machine carries the needle 6. cavity 49 is arranged inthe feeding bar 45 On the plate 1 aratchet wheel 8 is rotatably and Vin the central portion of this cavity mounted on the lower surface of which a a longitudinal bar 50 is fixed. Theedges pinion 9 is rigid which extends through an :of the box-shaped cavity have teeth 51. The

aperture 10 of plate 1. The axle 11 of the pinion9 of the ratchet wheel 8 engages with 9o ratchet wheel 8 is journaled in a transverse this box-shaped cavity and the axle 52 of bar 12 fixed on plate 1, (Fig 2 on which the pinion 9 (Fig. 4) is guided between the transverse bar a spring 13 is xed which `edges of the box-shaped cavity and the acts as a locking pawl and permits of a rotacentral bar 50. The feeding bar has a tion of the ratchet wheel 8 only in the direcnose 55 in the range of the box-shaped cav- 95 4o vtion of the arrow 14. A ratchet pawl 15 ity 49,'said nose cooperating with a spring engages further with the Aratchet wheel 8, 53 and it has further a nose 56 on the other said pawl being oscillatably mounted on a side and at the end which cooperates with a bolt 16. Bolt 16 is threaded and adapted to spring 54,. be rotated by means of a hand wheel 19, vThe two armed lever 17, pivoted on 10o 45 whereby the ratchet pawl 15 can be disbolt 18, has a slot 27 engaging over a screw placed in the longitudinal direction of the 28 screwed into the needle rod 7 (Fig. 7). bolt 16 so that the point at which the pawl A plate 67 corresponds with the stitchengages with the ratchetwheelis changed plate of the sewing machine and has an and the angle is Vvaried at will through aperture for the passage of the needle 6, said 105 which theratchet wheel is rotated by said plate 67 being adapted to be easily fixed on ratchet pawl. l 'the stitch plate of thel sewing machine in a.

Bolt 16 is fixed in the end of a two-armed suitable manner. This plate 67 covers the lever 17 pivotally mounted on a bolt 18. feeder 68 of the sewing machine. I The lever 17 has a guide slot 20 for a bolt The cloth is inserted in the direct-ion of 110 21 on which a. lever 22 is fixed, the other end the arrow 69 (Fig. 7) between the buttonhole of which is connected at 23 with a bearing sewing apparatus and plate 67. As soon 22 at this portion of the movement.

as the sewing machine begins to work the needle rod 7 with the needle 6 descends and ascends in the well lrnown manner. The feeder 68 of the sewing machine does however not act upon the clotlr as it is covered by the plate 67. rlhe cloth is fed exclusively by the feeder 46 of the buttonhole sewing apparatus. At the descending and ascending movement of the needle rod 7 the levei 17 is drawn along by the screw 28 and swung up and down. At the upward movement of lever 17 the bolt 2l (Fig. 3) of lever 22 slides at first along the slot 2O so that the lever 17 moves idly with regard to the rod At this movement the ratchet pawl l is however advanced and makes the ratchet wheel 8 and consequently the pinion 9 rotate a determined angle, whereby the feeding bar 45 is moved in longitudinal direction. As soon as the bolt 2l of lever 22 has arrived at the end of slot 2O the lever 22 is drawn along whereby, through the intermediary of the lever 25, the bar 29 is moved to the left with regard to Fig. 2, into the position shown in Fig. 6. At this time the bolt 30 slides along in the slot 34 of the aperture 32 of plate l (Fig. l) and strikes at the end of its movement against the shoulder of the aperture 3S of plate 36 so that -this plate 36 is brought from the position Fig. 2 into the position Fig. 6. rlhe bolt 37 oscillates consequently in the slot 31 of plate l and as the bolt 37 engages with the slot 48 of the feeding plate, this feeding plate is also moved in transverse direction the same amount as the bolt 37. rIhe bolt 37 is adjustable in a. slot 4l (Fig. 6) of its plate 36 whereby the'lateral oscillation of the feeding bar 45 may be varied at will. lf the needle rod descends again the elements return into the position shown in Figs. 2 and 3, but with the difference that the bolt 30 now occupies the opposite corner of the plate 36 adjacent the incline 39, the ratchet pawl moving idly over the teeth of the ratchet .wheel 8 and the bolt 30 of rod 29 moving` back through the arm 34 of the aperture 32. At the first ascending movement of the needle rod the bolt had been brought, by the action of arm 34, from the position shown in Fig. 2 into the position shown in Fig. 6. If the needle rod 6 ascends again, bolt 30 being thus moved back, it is brought by the inclined face 39 of plate 36 into' engagement with the arm 33 of the aperture 32 so that the bolt 30 bears against the other shoulder of the aperture 38 of plate 36 and returns this plate into the position shown in Fig. 2.

At one ascending movement of the needle rod the plate 36 is therefore rotated once to the right and at the next ascending movement once to the left whereby the bolt 37 of this plate 36 is moved to and fro the stitch for the buttonhole is producer.V

'.lhe axle 52 of the pinion 9 slides with reward to Fie'. 4 of the dran'ingr at first alonO t9 t? s, b the lower portion of the aperture 49 and advances thereby the feeding bar in longitudinal direction parallel to the buttoiiholc (Fig. so that the seam 66 is produced.

lf the axle 52 oi the pinion 9 has arrived at the left end (Fig. 4) of the guide in the feeding bar 45 the nose 55 of bar 45 comes in contact with spring 58 so that the axle 52 the pinion 9 engages with the upper portion of the box-shaped cavity 49 and works now on the other side of the bar 50V engaging with the teeth in this portion of the cavity. The feeding bar is thus moved in lateral direction such a distance that it displaces the cloth underneath the` needle in such a manner that the cross stitches produce the seam 6l (Fig. 8). time the feeding `bar is moved in opposite direction as before through the action of the axle 52 of the pinion 9 so that now the other side of the buttonhole is sewn in opposite direction as before.

The box-shaped cavity 49 may be extensible in a convenient manner so that the length of the buttonhole can be varied according to requirement. At the other end of the longitudinal movement the` nose 56 (Fig. 4) of the feeding bar comes in contact with spring 54 so that the axle 52 of the pinion 9 is again brought to the other side of the central bar 50.

l claim:-

l. A buttonhole sewing apparatus, comprising a horizontal plate having a forli` shaped aperture at the right end and a rectangulaiaperture for the needle of the sewing machine, a seini-circular aperture close to said fork-shaped aperture and an aperture nearv the left end7 a foot on the upper surface of said plate for fixing said plate on the presser bar of the sewing machine, a ratchet wheel rotatably mounted near the left end on said plate, a. feeding bar inovably mounted on the lower surface of said plate and having a central aperture, a rectangular cavity near the left end and a longitudinal slot near the right end, a vertical axle of said ratchet wheel, a pinion keyed on the lower end of said axle and extending into said aperture at the left end of said plate, a longitudinal bar extending over said ratchet wheel and fixed on said plate, said axle of said ratchet wheel being journalled At the saine i in said har, a blade spring on said longitudinal bar and having a hook-shaped end engaging with said ratchet wheel, an upright support on said plate, a two-armed lever pivotally mounted in said support and having a longitudinal slot in its front arm and an open slot in the end of its front arm gripping over the guide screw of the needle bar, a pawl hingedly mounted on the rear end of said two-armed lever and engaging with said ratchet wheel, a system of articulated levers upon the front part of said plate, a stud on the rear end ofsaid system of articulated levers and engaging with said longitudinal slot of said two-armed lever, an apersupporting plate, a downwardly projecting pin on said oscillatalole plate projecting through said semi-circular aperture of said supporting plate and through the longitudinal slot of said feeding bar, a feeder on the central portion of said feeding bar on the lower surface of the same and having an aperture corresponding with said central aperture of said feeding bar, and means in the rectangular cavity of said feeding har at the left end'of the same for operatively engaging said pinion on said ratchet wheel.

In a button hole sewing apparatus as claimed in the preceding claim, in Combination with said ratchet wheel, pinion, and

feeding bar having a rectangular cavity near l the left end, a longitudinal bar in the centre of said cavity, teeth along the edges of said rectangular cavity of said feeding har and meshing with said pinion.

In testimony whereof I aix my signature.

FRITZ FROHLICH. 

